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Lease liabilities (non-current and current) - Summary of Changes in Carrying Amount of Lease Liabilities (Details) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Non Current And Current Portion Of The Lease Liabilities [Abstract]
Balance at beginning of year	€ 62,327	€ 51,849
Additions for new leases	5,215	9,773
Interest expenses	3,809	3,090	€ 2,877
Lease payments	(14,097)	(14,147)	(12,926)
Disposal of leases	(1,911)	(172)
Adjustments due to remeasurements	43	584
Adjustments due to modifications	9	11,867
Effect of translation adjustments	2,356	(517)
Balance at end of year	€ 57,750	€ 62,327	€ 51,849

X

- Definition

The cash outflow for leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 53
-Subparagraph g
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_g&doctype=Standard
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 47
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2024-03-27

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Additions to lease liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Adjustments due to modifications of leases.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Adjustments due to remeasurements of leases.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Cash outflow for lease interest.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Disclosure Of Non Current And Current Portion Of The Lease Liabilities [Abstract].

+ References

No definition available.

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Namespace Prefix:	ntz_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Disposal of leases.

+ References

No definition available.

+ Details

Name:	ntz_DisposalOfLeases
Namespace Prefix:	ntz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Increase decrease in translation adjustments.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntz_
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